Analog Electronics
The current gain of a pnp transistor is

 the ratio of collector current to emitter current.
 near zero.
 the negative of the npn current gain.
 the collector current divided by the emitter current.

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and single-ended output.
  differential input and differential output.
  differential input and single - ended output.
  single - ended input and differential output.

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